TORSIONAL CURRENT - METER FOR CHANNELS

摘要

The main objective of this paper is to present the results ofthe experimental investigation of a Zarea-type torsionalvelocity-meter. For this, a torsional meter was designed, builtand tested in the laboratory. The current meter consists of anaxial rotor with blades fixed to a shaft which is in turn fixed to arigid hub. The force of the water flow produces a torque whichdeforms the shaft. The current meter has been staticallycalibrated, thereby establishing the variational curve of thetorsion angle as a function of the applied torque. A laboratoryfacility has been constructed in which tests were run for waterspeeds of up 3m/s. The torque measurements were taken byusing strain gauges. The methodology and the equipment usedfor the experimental evaluation are shown. Additionallyillustrated are the calibration curves, the analysis of obtainedresults, some advantages and disadvantages, and the range ofapplication of the torsional current-meter are all discussed.